Fluid pump



Feb 16,l 19327 A E. HUBBARD 2,070,791

FLUID PUMP Filed Feb.. 3, 1936A 'I Zzdeiz for;

jlfrlzey:

Patented Feb. 16, 1937 UNITED STATES PATENT OFFICE 5 Claims.

This invention relates to fluid pumps and more particularly to fluid pumps of the rotary type having movable vanes therein.

The primary object of this invention is to provide an improved rotary pump having movable vanes which will operate uniformly without sticking, and which is novel in construction and has a minimum number of parts and develops a minimum amount of friction.

Heretofore pumps of this type which had positively operated vanes arranged on an eccentrically mounted rotor were provided with operating means concentric with the axis of the pump chamber and friction developed between the vanes and the concentric means which absorbed much of the power necessary to operate the pump and thereby rendered the pump inefficient. It is another object of this invention to provide a pump having positively operated vanes without such friction producing means as a concentric operating member and thereby provide an emcie'nt pump and improve the operation thereof.

In the accompanying drawing illustrating a selected embodiment of the invention Fig. 1 is a side elevation of the pump with one cover plate removed;

Fig. 2 is a plan view of the pump showing a part thereof broken away;

Fig. 3 is a perspective view of one of the vanes; and

Fig. 4 is a view similar to Fig. 1 but showing a `modication of the invention.

Referring to the drawing, a substantially cylindrically shaped housing 5 is provided with legs 6 having bolt holes therein for mounting the pump in position for use where desired. The housing 5 has a circular opening therethrough forming a chamber 1 and is provided at one end with a cover plate 8 fastened to the housing 5 by bolts 9 and covering one end of the chamber 1. Another cover plate I is fastened to the other end of the housing by bolts I I and closes the adjacent end of the chamber 1. The housing is provided with a fluid intake port I2 at the top thereof adjacent one side and it is also provided with an exhaust port I3 at the top adjacent the opposite side. The cover plate III has a bearing I4 thereon which is arranged eccentric to the chamber 1 and in (Cl. 10S-140) tending flange I9 thereon. The body portion of the rotor engages the cover plate I0 and the ange thereon extends across the chamber 1 and engages the cover plate 8 to form an effective seal.

In the preferred form of my invention Figs. 1 and 2 I use two vanes generally indicated by 2l and 2I. The vanes comprise blades 22 having a curvature substantially the same as that of the periphery of the cylindrical wall of the chamber. The blades are free at one end and integral at the other end with anchor portions 23 and operating levers 24 are integral with the anchor portions at one side of the vanes. Pivot pins 25 are provided with axially extending slots 26 to receive the anchor portions of the vanes. The slots 26 extend substantially diametrically into the pins for a portion of the distance therethrough and at one end of the pins the slots extend completely through the pins to accommodate the levers 24. 'Ihe pivot pins are mounted in bearings 21 formed in the body portion I8 and ange I9 of the rotor and the pivot pin bearings are located substantially diametrically opposite each other. Openings 28 are provided in the flange portion of the rotor and extend through the bearings 21 to accommodate the levers 24. The inner ends of the levers 24 are curved to form engaging portions 29 which engage each other so that during rotation of the rotor and consequent movement of the vanes there will be line contact between the engaging portions and, therefore, a minimum amount of friction developed therebetween. 'Ihe body portion I8 and flange I9 on the rotor are recessed at 30 to receive the blades 22 and permit the outer surface of the blades to lie flush with the surface of the body portion and ange of the rotor when the blade portion of the vanes reaches its uppermost position in the chamber 1, Fig. 1. where the rotor contacts the outer wall of the chamber.

In order to manufacture my pump inexpensively I may make the housing of a comparatively soft metal. With the use of such materials appreciable wear would be produced if the blades 22 came in direct contact with the soft metal. To avoid this wear I provide a comparatively hard liner 3| for the housing. The liner will be tubular in shape and seamless or split. The liner is of a width slightly geater than that of the housing and when inserted in the housing the sides of the liner will extend slightly beyond the sides of the housing. The cover plates are grooved at 8' and III respectively to receive the side portions of the liner which is held in position by the housing and cover plates. If it is made of a split tube I prefer to locate the split slightly toward the intake side of the top of the housing, Fig. 1. I prefer this location of the split inasmuch as the split should be close to the contact point of the rotor with the liner as this location reduces wear at the split due to the sliding action of the blades thereover. The radius of curvature of the blade being the same as the` cylindrical wall of the chamber, the pressure of the blade on the liner when the forward end of the blade reaches the point of contact between the rotor and liner is exerted at the forward end of the blade. However, the forward end of the blade will not exert a great force against the liner for a short distance after leaving the contact point as the Whole blade will be flush with the liner and the blade will be partially depressed into the recess 30. Consequently, if the split is located within this short distance there will not be a digging tendency of the forward end of the blade at the split. I provide an opening 32 in the liner at the intake port I2 and an opening 33 in the liner at the exhaust port I3 in the housing so that communication is established between the ports and the chamber. The closing of the blade of the vane 2l by the liner will operate the lever integral therewith against the lever integral with the blade of the vane 20 to open the blade of the vane 20, thus holding the free end of the blade of the vane 20 against the liner and when the blade of the vane 20 begins to close it will operate the lever integral therewith against the lever integral with the blade of the vane 2l to open the blade of the vane 2l and hold the end thereof in contact with the liner. It will thus be seen that the vanes of my pump cooperate with each other and with the liner to positively operate the blades without the intervention of any other operating means and it is impossible for any one-or both of the blades to stick or become sluggish and render the operation of the pump ineiiicient or produce a complete failure of operation. The only moving parts in my pump are the rotor and vanes which move with their respective pivot pins and not relative thereto. 'I'he curvature of the engaging portions 29 of the levers is such that in all positions of the levers there is line contact therebetween. 'Ihis provides for a substantially frictionless and very eflicient operation of my pump.

In Fig, 4 of the drawing I have illustrated a modification of my invention wherein I provide two pairs of vanes when such a structure is desirable. The pair illustrated horizontally opposite each other are substantially identical/in structure and operation to the pair of vanes illustrated in Fig. 1 and the pair of vanes illustrated vertically opposite each other are the same except that the levers 24 thereof are located adjacent the levers 24 of the blades of the other pair and the portions of the slots 26 that extend completely through the pivot pins 25 are located inwardly of the ends of the pivot pins to accommodate the levers 24 of these vanes. The operation of the vanes is the same as has been described in connection with the form illustrated in Figs. 1 and 2.

I have shown and described my invention in a specic form but I wish it to be understood that changes and alterations may be made therein and I therefore do not wish to be limited to the precise details set forth but desire to avail myself of such changes and alterations as fall within the scope of the following claims.

I claim:

1. In a uid pump, a cylindrical housing having a cover plate at each end and forming a chamber therein having a cylindrical wall, inlet and outlet ports communicating with said chamber, a rotor in said chamber, and a pair of vanes mounted on the rotor and having integral parts on each of the vanes arranged to engage each other with line `contact to transmit motion from one vane to the other with a minimum of friction, said vanes arranged to engage the cylindrical wall whereby the vanes operate during rotation of the rotor to draw fluid into said chamber through the inlet port and force fluid out of the chamber through the outlet port.

2. In a uid pump, a cylindrical housing having a cover pate at each end and forming a chamber therein having a cylindrical wall, one of said cover plates having an eccentrically arranged bearing therein, a rotor mounted in said bearing, inlet and outlet ports communicating with said chamber, a pair of vanes each comprising an integral blade, Yanchor portion, and lever having an engaging portion thereon to engage the corresponding portion on the other vane with line contact, and a pair of pivot pins mounted on said rotor and each havinga slot therein to receive the anchor portion of a vane whereby the blade is engageable with said wall of the chamber and the engaging portions of the levers cooperate with each other to effect pivotal operation of the vanes during rotation of the rotor to draw uid into said chamber through the inlet port and force the fluid out of said chamber through the outlet port during rotation of the rotor.

3. In a iiuid pump, a cylindrical housing having a cover plate at each end and forming a chamber therein having a cylindrical wall, inlet and outlet ports comunicating with said chamber, a rotor in said chamber, a split liner for the cylindrical wall of said chamber and having openings therein registering with saidv ports, said rotor tangentially engaging said liner, a pair of vanes mounted on said rotor and arranged to cooperate with each other and blades on the vanes having a curvature equal to that of the liner arranged to cooperate withv said liner to operate the vanes to draw iiuid into said chamber through the inlet port and force thefluid out of said chamber through the outlet port during rotation of the rotor, the split in the liner arranged between the line of tangency and a point on the side thereof in the direction of rotation of the rotor not farther from the line of tangency than the length of the blades.

4. In a fluid pump, a cylindrical housing having a cover plate at each en d and forming a chamber therein, an inlet port, an exhaust port, a split liner for said chamber having openings therein registering with said ports, the sides of said liner extending beyond the sides of the housing and each cover plate having a recess thereinvto receive the extending sides of the liner whereby the liner will be held in position by the housing and cover plates, an eccentrically mounted rotor in said chamber having a body portion and a peripheral axially extending flange, a pair of pivot pins each having an axially extending slot therein extending substantially diametrically into said pin, a pair of bearings arranged substantially diametrically opposite each other in the body and fiange of said rotor to receive said pins, a pair of vanes each having a'blade with a free end and of a curvature substantially the same as the curvature of the liner, an anchor portion, and an operating lever having an engaging portion thereon, said anchor portions arranged in the slots in the pivot pins to provide engagement within the flange ofthe engaging portions of the levers with each other and engagement of the iree ends of the blades with the liner, said rotor tangentially engaging said liner and the split in the liner arranged adjacent the line oi tangency on the side thereof in the direction of rotation of the rotor, the rotor having recesses in the periphery thereof adjacent said bearings to receive the blades during operation of the rotor.

5. In a uid pump. a cylindrical housing having a cover plate at each end and forming a chamber therein having a cylindrical wall, inlet and outlet ports communicating with said chamber, a rotor in said chamber, a plurality of pairs of vanes drical wall of said chamber to operate the vanes to draw iiuid into said chamber through the inlet port and force the uid out of said chamber through the outlet port rotor.

HENRY E. HUBBARD.

during rotation of the 10 

